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- Altitude of a triangle
This online calculator computes the length of a altitude of a triangle, given the lengths of edges of a triangle.

- Altitude Pressure
This calculator uses barometric formula to find out the pressure at the given altitude

- Angle bisector of a triangle
This online calculator computes length of angle bisector given the lengths of triangle edges

- Area of a convex quadrilateral. Example of creating a calculator.
This online calculator calculates area of a convex quadrilateral given diagonal values and value of angle between them. Article also describes the process of creating a calculator.

- Arithmetic progression
This online calculator computes last nth term of arithmetic progression and sum of the members

- Bank card number validation
The calculator checks a bank card number using Luhn algorithm, it also determines the card issuer according to Issuers handbook.

- Barometric leveling
- Base 64 encoding and decoding
The calculators encode string to base64 string and decode back to original string. Special characters (+/) , generally produced by base64 algorithm, can be replaced by the data provided in additional parameter.

- Beaufort scale
Conversion between wind speed measurement units including Beaufort numbers, km/h, m/s, mph, fps.

- Binary Coded Decimal (BCD)
This online calculator converts decimal number to binary code in BCD notation and vice versa

- Binary numbers calculator
This calculator supports common mathematical operations over binary numbers

- Binary, inverse and complement codes
Binary, one's complement (inverse) and two's complement codes (calculator was created by user's request)

- Boiling point dependence on the altitude above sea level
- Caesar cipher
Calculator encrypts entered text by using Caesar cipher. Non-alphabetic symbols (digits, whitespaces, etc.) are not transformed.

- Calculation of payments on corporate property tax
Calculation of the tax amount and the amount of advance tax payments in accordance with Chapter 30 of the Russian Federation Tax Code

- Calculation of the volume by weight
Calculation of the volume and parameters of regular geometric figure by given mass using density of matter reference book.

- Calculation of weight by volume
Calculating the weight by the volume of material with matter density reference book

- Calculation of weight by volume
Calculating the weight by the volume of material with matter density reference book

- Cartesian and polar two-dimensional coordinate systems
This online calculator converts polar coordinates to cartesian coordinates and vice versa.

- Compass Points
The calculator gives name of compass point by direction angle in degrees.

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